http://dealbook.blogs.nytimes.com/2009/12/03/a-20-something-makes-a-mint-and-sells-it-to-intuit/
"Mint.com makes its money by helping identify savings opportunities
for users. For example, Mint might suggest: �You�ve got $20,000 in
your Wells Fargo savings account earning 0.10 percent interest. You
could make 1.9 percent at Ally Bank, and that�s worth $360 over the
next year.� We find better interest rates on checking, savings and
CDs; lower interest rates on your credit cards, or more rewards if you
pay them off in full; investment and I.R.A. options based on your
unique financial profile, and a new auto insurance savings engine that
lets you know how much above or below the average for your ZIP code
you�re paying for coverage. Every offer is unique to your financial
situation, so two different users may see very different suggestions.
If you sign up for a new account via Mint.com, we get paid a referral
fee."
If you need a basic personal finance expense/income tracking tool,
this free one is tough to beat.
Most of their offers are based on their not knowing the interest I
actually don't pay (since I carry no balances) on credit cards or
checking or savings interest.
Other than that, it works pretty well.
Anoop